During inclement weather, we use the Socrata open data tool to keep our master list of what's open, closed, or changed. This lets our departments, the press (including neighborhood blogs) easily embed a real-time updated list on their Websites.
We used our open data tool to create a form and collect damage reports from citizens following a snowstorm. We were able to pass the data along to the state of Washington in a format they could consume.
Regional Animal Services of King County keeps their pet events calendar in an open data format, which not only shows on our Website but allows animal groups to incorporate our calendar into their Websites.